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The weaceByToString also allows you to manipulate the roteroute, for example by replacing a node with other nodes. As opposed to weaveById, this method uses the toString representation of the node(s) when matching. This allows you to match nodes, which may not have assigned ids, or to match EIP pattern.
You have to be a bit more careful when using this as the toString representation can be verbose and contain characters such as [ ] ( ) -> and so forth. That is why using the regular expression matching is the must useable.

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